Jib-crane excavator



Aug. 23, i

.5. KING JIB CRANE EXCAVATOR Filed July 5, 1924 s Sheets-Shoot 1' Aug. 23, 1927. l 5' KING J 13 CRANE EXCAVATOR Filed July 5, 1924 I 3811001184110:

Aug ,23, 19271 1,640,124 5. KING JIB CRANE EXCAVATOR Filed J u1y 3, 1924 5 Sheets-Sheet 3 Patented Aug. 23, 1927.

UNIT-ETDASTATES 1,640,124 ATENT O E SAMUEL KING, or CARLINGFORDQITEW SOUTH WALES, AUSTRAIQIA.

J'IIB-CRANE EXCAVATOR.

7 Application filed m a, 19'24,'seri a1 No.

This invention relates to improvements in jibcrane excavators, and has been devised with the view to providing apparatus for the purpose whichycan be attached to an the upper portion or swan neck of the jib,

are attached two or rnore stay rods. or arms which extend downwardly and are pivoted about midway to arunway or ladder which forms the excavator track. The upper end of this ladder is coupled to the ram cross head and the lower end turned outwardly 1n Adapted a short radius for some distance. to travel in this ladder or runway, is a carriage, the excavator bucket being pivoted or hingedto said carriage. A catch or trigger is positioned at the upper portion of'the ladder and is adapted to engage with the first or leading axle of theexcavator carriage when at the top of its travel, to hold same while it is being'emptied. A winding drum and a winding rope are provided'on the crane, the end of the rope being passed oversuitable pulleys on the bucket, and secured to eye bolts on the carriage. The ram is of the double acting type and is provided with control valves on each end of the cylinder, said valves beingchain and wheel controlled. f I

A further chain and wheel is provided running parallel with the ram, and has stops so that on the ram being driven outwardly, the cross head suitably providedwith an arm or the like, will engage such stops to cut off the valve controlling the outward travel of the ram.

In the case of oil or electric power, I provide racks and gears, .or other suitable means, in place of the steam ram, to move the upper end of the ladder of the excavator.

But in order that my invention-may be more clearly comprehended. I will'now refer to the accompanying drawings in which is illustrated an excavator as applied to a steam jib crane. Y

7 Figure his a side elevation of the excavator with the bucket in the lowered position, the dotted'lines illustrating the bucketwhen raised, and

724,098.21 in Australia July :1, 192:.

the excavator with the bucket cutting-into the side of an embankment. the dotted line illustrating the bucket discharging.

Figure 2 is an enlarged side elevation of Figure 3, is-aside elevation of the excavator bucket and the bucket carriage, 1n the closed position, while Figure 4, is a similar view with the bucket in .the open position-for discharging.

Figure 5, 1s a part sectional elevation 111115- trating the rear wheel of the bucket carriage in the channel or side member of the runway or ladder. i I

Figure Sis-a part sectional sideelevation of the locking means for the bucket carriage.

' Figures 7 and 8, are part side and plan views respectively of the steam ram. I The same numerals lndicate like parts throughout the drawings.

12, while 13 are the supports orstay rods to. which is pivoted about midway, the exca- 11 is the steam crane with'swan, neck vator ladder or' runwayv 14;. uThis ladder comprises two side channels in'which are adapted to run the wheels 15 of the" bucket carriage 16 to which is hinged at 17- the bucket 18. This bucket 18 is providedwith teeth 19 at its forward end and has p'ulley wheels 20 at each side over which pass the pulling rope 21, the end of which "is secured 1 to the eye bolts 22. The ladder-v14 is turned in a short radius outwardly at '23, at, its

lower end and is provided at its upper end 2twith means for pivotally connecting it to the ram crosshead 25. The ram 26 has valves 27 and 28 one at each end of the c'ylinder. which are controlled by the chain 29 and the wheels 30 moved by the operator on I the crane 11. Chain 35, provided with stops 36 with which the arm 37 on the ram crosshead 25 is adapted to contact. controlthe opening and closing of the valves 27 and 28 while the ram is in operation.

A pulley 31 is provided on the jib 12 over which the pulling ropev21 passes to the crane winding drum. A trigger or locking means 32 is provided on the upper portion of the ladder 1.4;, which engages the front or leading axle 33 ofthe bucket carriage 16 when the bucket is in the raised position, said trigger 32 being unlocked when desired, by

to travel, and 39 represents a truck or vehicle for removing the excavatedearth.

In operation, the excavator ladder 14 is swung into position, the ram 26 being in the inward position, and the bucket 18 lowered to its fullest extent. The bucket carriage 16 runs out on the radius 23 ot the ladder, which brings the teeth 19 ot the bucket approximately horizontal. The ladder 1 1 bears its Weight at the lower end. of the bucket. The ram 26 is then operated which forces the teeth 19 of the bucket into the embankment and the pulling rope 21 then wound up while the weight of the ladder together with that of the bucket acts to force the bucket to dig into the ground as wil be understood. This operation scoops earth into the bucket until the top of the embankment is reached. The bucket 18, when it has reached the position shown in Figures 1, 2, and 6 is locked by reason of the axle raising the trigger 32' which falls over the axle and so retains the carriage 16 in this position. The pulling rope 21 is then slightly lowered which allows the bucket 18 to swing down upon its hinges 17 thereby discharging the excavated earth into a truck or vessel 39' or the like. The operator may then release the ram 26, unlock the trigger 32 by operating the rope 34, thereby permitting the bucket 18 to descend by gravity to its lowest position, when the operation of excavating is again repeated. The crane 11 may be moved along the track 38 after each operation so as to obtain an even cutting of the bank.

1 I claim.

1. An. excavator comprising" a cranehaving a jib, a ram on the crane, a member having its end pivotally connected to the movable member of the ram for movement thereby on the crane and having an outwardl'y turned lower end, a stay connecting the crane and said meml er at a point midway the ends of said member, means to raise and lower the crane and to also correspondingly movesaid member, a carriage mounted on said member tormoveme-nt longitudinally. thereoi, a. bucket on the underside of said member pivotally connected-at its outer, closed end to said carriage and having its inner, open end presented toward the crane, a cord attaohed to the carriage and slidably connected to the open end of the bucket, and means to operate said cord to first hold the bucket substantially parallel with the carriage, to then draw the bucket and carriage upwardly on the underside oi? said member and to finally release said bucket to enable it to swing downwardly and outwardly and discharge its contents from its open end when the bucket 11 as reached a desired elevation.

2. An excavator comprising a crane having a jib, a member pivotally connected to the crane and having an outwardly turned lower end, a stay connecting the crane and said member, means to raise and lowerv the crane and to also correspondingly move said member, a carriage mounted on said member for movement longitudinally thereof, a bucket on the underside of said member pivotally connected at its outer, closed end to said carriage and having its inner, open end presented toward the crane, a cord attached to the carriage and slidably connected to the open end of the bucket, and means to operate said cord to first hold the bucket substantiall y parallel with the carriage, toth-en draw the bucket and carriage upwardly on the underside oi said member and to finally release said bucket to enable it to swing downwardly and outwardly and discharge its contents from its open end whenthe bucket has reached a desired elevation, and means to detachably hold the carriage and hence the bucket in such elevated position, said means comprising a gravitating trigger p-ivotally mounted on said member and e'ngageab-le with a member of said carriage,'and a cord to operate said trigger. v V

In testimonv whereof I have hereunto set my hand.

SAMUEL KING; 

